Warner is already in development on a sequel to "Man of Steel" and is expected to fast track that for release as soon as 2014, said knowledgeable people close to the studio.

In addition, it has long been developing a "Justice League" team-up movie featuring characters such as the Flash and Wonder Woman that could come out as soon as 2015.

If Man of Steel 2 does, indeed, get a 2014 release, Snyder and company would have to begin production ASAP. It's currently thought that the DC shared movie universe has been planned by Warners for quite a while as both Cavill and Goyer are signed on for three-picture deals, so if they begin immediately it could be a possibility. In addition, WB was said to want Justice League first to compete with Marvel Studios with a 2015 release date. So, if anything, the Man of Steel sequel would be the only movie to get moved up, which has been noted to be "fast-tracked."

However, more than likely the 2015 release date for Man of Steel 2 seems more realistic.